//
// Created by 123 on 2025/1/7.
//
#include "string"
#include "iostream"
using namespace std;

void test(){
    string str1;
    cout << "str1=" << str1 << endl;

    const char* charStr = "hello world";
    string str2(charStr);
    cout << "str2=" << str2 << endl;

    string str3(str2);
    cout << "str3=" << str3 << endl;
}


int main112(){
    test();

    return 0;
}